<p>给你一个 <code>m</code> 行 <code>n</code> 列的矩阵 <code>matrix</code> ，请按照 <strong>顺时针螺旋顺序</strong> ，返回矩阵中的所有元素。</p>

<p> </p>

<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/11/13/spiral1.jpg" style="width: 242px; height: 242px;" />
<pre>
<strong>输入：</strong>matrix = [[1,2,3],[4,5,6],[7,8,9]]
<strong>输出：</strong>[1,2,3,6,9,8,7,4,5]
</pre>

<p><strong>示例 2：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/11/13/spiral.jpg" style="width: 322px; height: 242px;" />
<pre>
<strong>输入：</strong>matrix = [[1,2,3,4],[5,6,7,8],[9,10,11,12]]
<strong>输出：</strong>[1,2,3,4,8,12,11,10,9,5,6,7]
</pre>

<p> </p>

<p><strong>提示：</strong></p>

<ul>
	<li><code>m == matrix.length</code></li>
	<li><code>n == matrix[i].length</code></li>
	<li><code>1 <= m, n <= 10</code></li>
	<li><code>-100 <= matrix[i][j] <= 100</code></li>
</ul>
